I recently was in a discussion where one of the people, as an argument, claimed that Jews have been known to participate in what's activities clearly detrimental to Jews as a whole (the argument itself had nothing to do with Jews, it was merely an analogy). To support his argument, he made two claims that really didn't sound very convincing to me though he indicated he was certain both were factual as opposed to myth.
The second claim (first one brought on this Q) was that there were known large Jewish organizations that officially and actively support/lobby for the destruction of Israel today.
Do such organizations (as opposed to one or two wacky individual Jews) exist? Or was that just an exaggeration for the sake of making an argument?
Please note that I'm not asking about some supposedly rumored jew (e.g. president of Iran is not a valid example).